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EXAMINER Patented Feb. 28. 1882.

Ill/ll 1 O 6 8 4 CROSS REFERENCE No Model.)

. P. H.;GRIPPIN.

GORE FOR BASH WEIGHTS.

I --P. HENRY GRIFFIN, on'nnrnom MIOHIGAR- cone For: SASiH-WilGHTS.

erx'omcsr rorr forming or rm; no. rem as, less, App} iestlen'fl1ed8ohtenhcr1.1m. (new Y .j

1'ogllwlmhitmagoonoem: j Be it known'that I, I, HENRY GRIFFIN, ofDetroit, in the county of Wayne and Stateof Michigan, have invented anImprovement in 5 Cores for Casting 'SashNVeIghts, of which the followingis a specification. l

- The nature of this invention relates too new and :nsefnl core .forcasting sash-weights, by r means of which a large saving of metal isobnotninedwithont deteriorating the value of the weight. In theaccompnnyingdrawing a s ash-weight rovided with my improved permanent'core is shown in vertical central section. :5 .Themolding is done inthe usual manner, after which a core, A, is'inserted into the mold andsecured in place by anyofthe known: and

4 approvedmethods, -The core is made of sand of the usual char- 2o,acter for cores, mixed,.with silicateol' soda,

preferably in the proportion of twenty (20) proportions named.

tain itsproper shape, and is then-dried in the usual manner before beingplaced inthe mold. In casting, a thin shell, 13, of iron is castaroundthe core,'and the heat ofthemolteu. metal converts the core intoevery hard. enho stance "resembling artificial stone of I great;density.- The core varies but slightlyin spe- 'cific grayity from theiron' surrounding it-,an1 l cannot-he removed from the casting. By theuse of this core Inm enabled to pro-.35 1 duce a weight wherein a'largeproportion of the metal is saved, the core becoming practically integralwith the iron and difl'eri-ng therein {tom the ordinary cores, yzhichheeonte'disintegrated by the heat of the moltenmetaland 40 are easilyremoved from the oasting. What I claim as my'inventiou ifir- A core forcasting sash-weights, composed of sand and silicate of soda, as and forthe par posespecifled, 4

- P, HENRY GRIFFIN,

